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What kind of tires are you driving on? I only ask because I have snow tires that make virtually the same noise. The car was out of alignment for a long time, got it aligned and the uneven wear in the tires because an audible noise like you're describing.

I haven't had a chance to jack the car up yet, but I thought I would add this tidbit.

As my wife was leaving for work, she drove forward, through the yard and circled back around to get back on the driveway (I was parked behind her, preventing her from backing out). When she slowed at the end of the driveway, the clicking started. I could hear it very well from about 50 ft away.

It's a fast-paced clicking, like it may be associated with something spinning at a constant speed, regardless of vehicle speed. I will srill check the wheel bearings for noise, but if there are any other suggestions for areas to check, I'm all ears and very appreciative.

I do realize it's hard to diagnose over the internet and I may not be describing it with 100% accuracy, but that's all I have at the moment. I'm working and the car is driven by my wife at various times of days and nights due to school and work. Thanks!

Getting closer. I haven't had a chance to check wheel bearings, but I did spend some quality time driving around the neighborhood, testing.

My wife drives the car, primarily, and mentioned that it didn't seem to make the noise when the A/C was off. I decided to give it shot and here's what I noticed:

When the revs are going up, at exactly 1500 rpms in 2nd, 3rd and 4th, there is a noise that sounds like someone running their thumb across the end of a deck of cards. This happens with the A/C off or on. I suspect something loose. With the A/C off, the clicking sound mentioned earlier in this thread doesn't happen.

Now, with the A/C on, I still get the noise at 1500, as the revs climb, but I also get the clicking (which more realistically sounds like thin metal vibrating) as the revs are falling. It happens somewhere around 1200 and 1300 rpms. Also, the car doesn't have to be moving, as earlier thought. I sat in the driveway and revved the engine with the A/C on and was able to hear the noise.